Tropical Storm Allison formed in the Gulf of Mexico on June 5. On that afternoon, the 
National Hurricane Center named the storm, having never designated it as a tropical 
depression. The system developed from a disturbance off the coast of Texas. It moved 
ashore about 30 miles north of Houston that night, and quickly weakened to a tropical 
depression. Despite being downgraded, the system brought up to a foot of rain to the 
Texas and Louisiana coasts during proceeding days. Tropical Storm Allison reached 
highest sustained winds of 35 mph and a lowest central pressure of 1004MB.

********************************************* DETAILS **************************************
06-06-2001
081 
 WTNT31 KNHC 060836
 TCPAT1
 BULLETIN
 TROPICAL DEPRESSION ALLISON ADVISORY NUMBER   4
 NATIONAL WEATHER SERVICE MIAMI FL
 4 AM CDT WED JUN 06 2001
 ...CORRECTED RAINFALL SECTION...
 ...ALLISON WEAKENS TO A DEPRESSION...THREAT OF HEAVY RAINS 
 CONTINUES...
 
 AT 4 AM CDT...0900Z...ALL TROPICAL STORM WARNINGS ARE DISCONTINUED.
 
 AT 4 AM CDT...0900Z...THE POORLY-DEFINED CENTER OF TROPICAL 
 DEPRESSION ALLISON WAS LOCATED NEAR LATITUDE 30.2 NORTH...LONGITUDE  
 95.3 WEST OR ABOUT 30 MILES NORTH OF HOUSTON TEXAS.
  
 ALLISON IS MOVING TOWARD THE NORTH NEAR 6 MPH...AND A SLOW NORTHWARD 
 MOTION IS EXPECTED TODAY.
  
 MAXIMUM SUSTAINED WINDS ARE NEAR  35 MPH... 55 KM/HR...WITH HIGHER
 GUSTS.  FURTHER WEAKENING IS LIKELY DURING THE NEXT 24 HOURS.
  
 ESTIMATED MINIMUM CENTRAL PRESSURE IS 1004 MB...29.65 INCHES.
 
 ADDITIONAL RAINFALL TOTALS OF 4 TO 5 INCHES...WITH LOCALLY HIGHER 
 AMOUNTS...ARE POSSIBLE OVER PORTIONS OF SOUTHEASTERN TEXAS AND 
 SOUTHERN LOUISIANA.
 
 AN ADDITIONAL ISOLATED TORNADO OR TWO IS POSSIBLE OVER SOUTHEASTERN 
 TEXAS AND SOUTHERN LOUISIANA TODAY.
  
 FOR STORM INFORMATION SPECIFIC TO YOUR AREA...PLEASE MONITOR
 PRODUCTS ISSUED BY YOUR LOCAL WEATHER OFFICE.
 
 REPEATING THE 4 AM CDT POSITION...30.2N  95.3W.  MOVEMENT
 TOWARD...NORTH NEAR  6 MPH.  MAXIMUM SUSTAINED
 WINDS... 35 MPH.  MINIMUM CENTRAL PRESSURE...1004 MB.
 
 THIS IS THE LAST PUBLIC ADVISORY ISSUED BY THE NATIONAL HURRICANE 
 CENTER ON ALLISON.  FUTURE INFORMATION ON THIS SYSTEM CAN BE FOUND 
 IN STORM SUMMARIES ISSUED BY THE HYDROMETEOROLOGICAL PREDICTION 
 CENTER...UNDER AWIPS HEADER NFDSCCNS1 AND WMO HEADER ACUS42 KWBC...  
 BEGINNING AT 10 AM CDT.
  
 FORECASTER PASCH
  

WTNT3 Archive

 
Official NOAA/NHC Forecast Discussion 


793 
 WTNT41 KNHC 060832
 TCDAT1
 TROPICAL DEPRESSION ALLISON DISCUSSION NUMBER   4
 NATIONAL WEATHER SERVICE MIAMI FL
 5 AM EDT WED JUN 06 2001
 
 SURFACE SYNOPTIC AND WSR-88D DATA SHOW AN ELONGATED CIRCULATION WITH 
 AN ILL-DEFINED CENTER...WHICH APPARENTLY RE-FORMED NORTHWARD AND 
 CLOSER TO THE DEEP CONVECTION SEVERAL HOURS AGO.  THE SUSTAINED 
 WINDS HAVE DROPPED BELOW TROPICAL STORM STRENGTH...AND THE CYCLONE 
 IS EXPECTED TO CONTINUE GRADUALLY SPINNING DOWN OVER THE NEXT COUPLE 
 OF DAYS. 
 
 INITIAL MOTION ESTIMATE IS 360/5.  TRACK GUIDANCE GOES EVERY WHICH 
 WAY.  STEERING CURRENTS ARE LIKELY TO WEAKEN DURING THE NEXT DAY OR 
 SO.  GLOBAL MODEL FORECASTS SHOW ALLISONS REMNANTS GETTING STUCK 
 BETWEEN TWO ANTICYCLONES.  THEREFORE THE OFFICIAL TRACK FORECAST 
 SHOWS ONLY A LITTLE MORE NORTHWARD MOTION...KEEPING THE SYSTEM 
 STATIONARY THEREAFTER. 
 
 SINCE THE REMNANT LOW IS LIKELY TO MOVE SLOWLY...THERE IS A 
 CONTINUED THREAT OF HEAVY RAINS.
 
 THIS IS THE LAST ADVISORY ISSUED BY THE NATIONAL HURRICANE CENTER ON 
 ALLISON.  FUTURE INFORMATION CAN BE FOUND IN STORM SUMMARIES ISSUED 
 BY THE HYDROMETEOROLOGICAL PREDICTION CENTER UNDER AWIPS HEADER 
 NFDSCCNS1 AND UNDER WMO HEADER ACUS42 KWBC.
 
 FORECASTER PASCH
  
 FORECAST POSITIONS AND MAX WINDS
  
 INITIAL     06/0900Z 30.2N  95.3W    30 KTS
 12HR VT     06/1800Z 30.3N  95.3W    25 KTS...INLAND
 24HR VT     07/0600Z 30.5N  95.0W    25 KTS...INLAND
 36HR VT     07/1800Z 30.5N  95.0W    25 KTS...INLAND
 48HR VT     08/0600Z 30.5N  95.0W    20 KTS...INLAND...DISSIPATING
 72HR VT     09/0600Z...DISSIPATED
  
  

NOAA ARL Hurricane Prediction track model forecasts are no longer 
available on the WWW. We are working to prepare our own graphics. In 
the meantime, we provide links to text files for these products (all 
track models or GFDL only), and another quickly updated track map from 
Hurricane Alley. All guidance here should not be used in lieu of 
official guidance from the National Hurricane Center and local 
emergency management officials.

NOAA GFDL model guidance (text only, track only) 
NOAA NHC hurricane model forecast guidance (text only, track/intensity, 
all active storms) 
Hurricane Alley trackmap for this storm (from NHC bulletins). 
WTNT4 Archive
Guidance archive

 
Official NOAA/NHC (Marine) Advisory 


391 
 WTNT21 KNHC 060831
 TCMAT1
 TROPICAL DEPRESSION ALLISON FORECAST/ADVISORY NUMBER   4
 NATIONAL WEATHER SERVICE MIAMI FL   AL0101
 0900Z WED JUN 06 2001
  
 AT 4 AM CDT...0900Z...ALL TROPICAL STORM WARNINGS ARE DISCONTINUED.
  
 CENTER LOCATED NEAR 30.2N  95.3W AT 06/0900Z
 POSITION ACCURATE WITHIN  30 NM
  
 PRESENT MOVEMENT TOWARD THE NORTH OR 360 DEGREES AT   5 KT
  
 ESTIMATED MINIMUM CENTRAL PRESSURE 1004 MB
 MAX SUSTAINED WINDS  30 KT WITH GUSTS TO  40 KT.
 WINDS AND SEAS VARY GREATLY IN EACH QUADRANT.  RADII IN NAUTICAL
 MILES ARE THE LARGEST RADII EXPECTED ANYWHERE IN THAT QUADRANT.
  
 REPEAT...CENTER LOCATED NEAR 30.2N  95.3W AT 06/0900Z
 AT 06/0600Z CENTER WAS LOCATED NEAR 30.0N  95.3W
  
 FORECAST VALID 06/1800Z 30.3N  95.3W...INLAND
 MAX WIND  25 KT...GUSTS  35 KT.
  
 FORECAST VALID 07/0600Z 30.5N  95.0W...INLAND
 MAX WIND  25 KT...GUSTS  35 KT.
  
 FORECAST VALID 07/1800Z 30.5N  95.0W...INLAND
 MAX WIND  25 KT...GUSTS  35 KT.
  
 REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 30.2N  95.3W
  
 EXTENDED OUTLOOK...USE FOR GUIDANCE ONLY...ERRORS MAY BE LARGE
  
 OUTLOOK VALID 08/0600Z 30.5N  95.0W...INLAND...DISSIPATING
 MAX WIND  20 KT...GUSTS  30 KT.
  
 FORECAST VALID 09/0600Z...DISSIPATED
  
 THIS IS THE LAST FORECAST/ADVISORY ISSUED BY THE NATIONAL HURRICANE 
 CENTER ON ALLISON.  FUTURE INFORMATION ON THIS SYSTEM CAN BE FOUND 
 IN STORM SUMMARIES ISSUED BY THE HYDROMETEOROLOGICAL PREDICTION 
 CENTER UNDER AWIPS HEADER NFDSCCNS1 AND UNDER WMO HEADER ACUS42 KWBC 
 BEGINNING AT 06/1500Z.
  
 FORECASTER PASCH
   

WTNT2 Archive 

 
Official NOAA/NHC Forecast Probabilities 


878 
 WTNT71 KNHC 052033
 SPFAT1
 TROPICAL STORM ALLISON PROBABILITIES NUMBER  2
 NATIONAL WEATHER SERVICE MIAMI FL
 4 PM CDT TUE JUN 05 2001
  
 PROBABILITIES FOR GUIDANCE IN HURRICANE PROTECTION
 PLANNING BY GOVERNMENT AND DISASTER OFFICIALS
  
 AT 4 PM CDT...2100Z...THE CENTER OF ALLISON WAS LOCATED NEAR
 LATITUDE 28.8 NORTH...LONGITUDE  95.1 WEST
  
 CHANCES OF CENTER OF THE STORM PASSING WITHIN 65 NAUTICAL MILES
 OF LISTED LOCATIONS THROUGH  1PM CDT FRI JUN  8 2001
  
 LOCATION           A  B  C  D  E   LOCATION           A  B  C  D  E
  
 32.2N  94.8W      54  X  X  X 54   GALVESTON TX      99  X  X  X 99
 33.6N  93.9W      31  2  1  X 34   FREEPORT TX       99  X  X  X 99
 34.5N  92.6W       8 13  2  X 23   PORT O CONNOR TX   3  2  X  X  5
 NEW ORLEANS LA     X  X  2  X  2   GULF 28N 93W       X  1  1  X  2
 NEW IBERIA LA      1  3  3  X  7   GULF 28N 95W      99  X  X  X 99
 PORT ARTHUR TX    62  X  X  X 62
  
 COLUMN DEFINITION   PROBABILITIES IN PERCENT
 A IS PROBABILITY FROM NOW TO  1PM WED
 FOLLOWING ARE ADDITIONAL PROBABILITIES
 B FROM  1PM WED TO  1AM THU
 C FROM  1AM THU TO  1PM THU
 D FROM  1PM THU TO  1PM FRI
 E IS TOTAL PROBABILITY FROM NOW TO  1PM FRI
 X MEANS LESS THAN ONE PERCENT
  
 FORECASTER STEWART